\begin{table}[h]
 \centering
 \subtable[$key_5=1d87$]{
     \begin{tabular}{cc}
         0.0060 & 1\_8\_ \\
         0.0040 & 8\_8\_ \\
         0.0040 & 8\_1\_ \\
         0.0040 & 1\_1\_ \\
         0.0010 & f\_6\_ \\
         0.0010 & f\_1\_ \\
         0.0010 & e\_f\_ \\
         0.0010 & e\_8\_ \\
         0.0010 & e\_1\_ \\
         0.0010 & e\_0\_ \\
     \end{tabular}
 }
 \subtable[$key_5=b02b$]{
     \begin{tabular}{cc}
         0.0030 & b\_2\_ \\
         0.0020 & b\_b\_ \\
         0.0020 & 5\_b\_ \\
         0.0020 & 4\_2\_ \\
         0.0020 & 2\_b\_ \\
         0.0010 & d\_d\_ \\
         0.0010 & d\_8\_ \\
         0.0010 & d\_7\_ \\
         0.0010 & d\_4\_ \\
         0.0010 & c\_b\_ \\
     \end{tabular}
 }
\end{table}
